Natural gas.
Bioaccumulation
Higher trophic levels are animals that are higher up on the food chain. When animals lower on the food chain get effected by pollutants, it transfers to the animal that eats that one. And so on. So the animals on the higher trophic level eat the most animals(animals with the pollutants).
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by seeing what levels the fossil go to
Natural gas has many advantages but one of them is, It produces big amounts of energy, but lower levels of many air pollutants that coal or oil. One disadvantage of natural gas is that it is highly flammable. Hope I helped!
Natural processes will eventually remove air pollutants, if we stop inputting them at such massive levels. The prospect of removing air pollutants is interesting and seems favorable, but is ultimately myopic. What happens even if we can suddenly remove pollutants from the air? Where can we put them? In the ground? This would undoubtedly engender new issues. No, the question is not how to remove air pollutants, but how to live without producing them.
areas with high allergen levels
The burning of any fossil fuel creates this gas. The total combined fuel use by man produces over 5% of all CO2 produced. Levels of CO2 in the atmosphere can reach as high as 0.037% in some areas. Levels historically sit at 0.03% or so is the current belief.
High ozone levels are by lightening. Soldering also produces ozone.
Coal.
The gland which produces the hormone Calcitonin is the Thyroid. It is secreted in response to elevated blood calcium levels but only has a minor role in controlling calcium levels in humans.